Hydraulic pinion puller



April 13 1926. 1,581,057

G. s. HILL HYDRAULI C PINION FULLER Original Filed April 4, 1924 13 12 10 6 Y 1 23 i! Q Z2 .19 21 Fi/g. 2.

George S. Hill INVENTOR ATTORN EY WITNESS:

Patented Apr. 13, 1926.

UNITED STATES 1,581,057 PATENT OFFICE.

GEORGE S. HILL, 0]? IBERWICK, PENNSYLVANIA.

HYDRAULIC PINION FULLER.

App1ication filed April 4, 1924, Serial No. 704,224. Renewed February 27, 1928.

To all whom it may concern:

Be it known that I, Gnonen HILL, a citizen of the United States, res ding at Berwick, in the county of Columbia and State of"?ennsylvania, have invented new and useful Improvements in Hydraul c Plmon Pullers, of which the following 1s a specification.

This invention relates to gear pullers, and an object of the invention is to provide a gear puller in which a maximum gear or pinion pulling strlng may be applied to the gear or pinion to be removed from the shaft, upon the exertion of a relatively small amount of operating force.

A further object of the invention 1s to provide a gear puller as specified, in wh ch hydraulic power or pressure is used in conjunction with the adjustment of a feed screw for removing or pulling a 'gear or plmon from a shaft, the said hydraulic power cooperating with the feed screw in such manner as to relieve the threads of the screw of the resisting ower of the gear or pin on thereby materiallyiincreasing the longev1ty of the feed screw and permitting the use of a relatively small light feed screw 1n proportion to the amount of work performed.

Other objects of the invention will appear in the following detail description, and in the accompanying drawings where1n:

Figure 1is a side elevation of the 1mproved gear puller showing it use.

Figure 2-is a longitudinal through the gear puller.

Figure 3-is a detail cross section taken on the line 3-3 of Figure 1.

Referring more particularly to the drawings, the improved gear puller comprises a main cylinder 1 which has a cap 2 threaded on one end thereof. A gasket 3 is interposed between the end of the cylinder 1 and the head 2 to provide a fluid-tight connection therebetween. The cap 2 is adapted to form an abutment against the end of a shaft from which a gear or pinion, as shown at 4, is to be pulled, or removed. A second cylinder 5 is slidably mounted within the cylinder 1 and it has a sleeve 6 formed axially on its inner partially closed end 7, upon which sleeve a washer or gasket 8 is mounted and held tightly in place by means of a nut 9. The bore .10 of the sleeve 6 is adapted to permit oil to flow from the chamber 12 within the cylinder 5 into the chamber 11 section within the cylinder 1 in front of the cylinder 5 when the cylinder 5 is forced inwardly into the cylinder 1. The piston 13 is mounted upon a feed screw 14 and it has a suitable washer 15 thereon similar to the washer 8 so as to provide a fluid-tight engagement with the inner wall of the cylinder 5.

The feed screw 14 threads through a closure, nut 16 which is in turn threaded on the outer end of the cylinder 5. A wrench head 17 may be provided on the end of the feed screw 14 to facilitate manual rotation thereof.

The outer surface of the cylinder 5 is screw-threaded for a portion of its length, and an arm carrying nut 18 is adjustable over the screw threaded portion. A plurality of arms 19 are pivotally connected, as shown at 20, to the nut 18 and they have gear engaging fingers 21 pivotally connected thereto at their outer ends. The gear engaging fingers 21 have their inner edges 22 shaped to fit between the teeth of a gear or pinion, and their outer terminals are inturned, as shown at '23 to engage against the side of the gear or pinion 4, so that when the cap 2 is in abutting engagement with the end of a shaft, as at A upon which the gear or pinion 4 is mounted, and the feed screw 14 is rotated, the action caused thereby, will pull the gear or pinion towards the head 2 and the gear pulling device for removing it from the shaft. During the rotation of the feed screw 14 to advance piston 13, the threads of the feed screw are relieved of much of the wear and the resisting pressure by the action of the oil in the chambers 11 and 12. The pressureof the piston 13 against the oil causes cushioning action, resulting in the oil bearing the majority of the working strain of the device.

It is, of course, to be understood, that the invention may be constructed in various other manners and the parts associated in different relations, and therefore, I do not desire to be limited in any manner, except as set forth in the claims hereunto appended.

'hat I claim is:

l. A gear remover con'iprising a cylinder adapted to contain a fluid. a second cylinder slidable within said first cylinder and having fluid-tight connectiontherewith, a reduced duct establishing communication between the interiors of said first and second cylinders, a piston in the second cylinder, a nut threaded on said second cylinder, a feed screw connected to said piston and threaded throu h said nut, and means carried by said second cylinder for engagement with a gear.

2. A gear remover comprising a cylinder adapted to contain a fluid, a second cylinder slidable within said first cylinder and having fluid-tight connection therewith, a reduced duct establishing communication between the interiors of said first and second cylinders, a piston in the second cylinder, a nut threaded on said second cylinder, a feed screw connected to said piston and threaded through said nut, a nut adjustable on said second cylinder, and gear engaging arms pivotally carried by said last named nut.

3. A gear remover comprising a cylinder adapted to contain a fluid, a second cylinder slidable within said first cylinder and having fluid-tight connection therewith, a reduced duct establishing communication between the interiors of said first and second cylinders, a piston in the second cylinder, means for feeding said piston longitudinally in the second cylinder, means for engagement with adapted to contain a fluid, a second cylinder slidable within said first cylinder and havin fluid-tight connection therewith, a reduce duct establishing communication between the interiors of sai first and second cylinders, a piston in the second cylinder, a nut threaded on said second cylinder, a feed screw connected to said piston and threaded through said nut, a nut adjust-able on said second cylinder, gear engaging arms pivotally carried by said last named nut; and a shaft abutting cap removably mounted on one end of said first named cylinder.

In testimony whereof I afiix my signature.

GEORGE S. HILL. 

